Free Webinar: Low Compressive Strength Test Results
Date: Wednesday, November 11, 2026
Time: Noon – 1:00 pm CST
Cost: Free
Presenter: Amy Dowell, PE, American Concrete Institute
USE THIS LINK TO REGISTER FOR WEBINAR: Click Here
(email jackie@sdrmca.org if you have difficulties with the registration link)
Description: Compressive strength tests are used for concrete acceptance based on criteria defined in ACI 318 and ACI 301. Tests results not meeting these criteria are referred to as low strengths. This presentation covers the “low strengths” topic in detail and provides answers to questions such as: what is considered a strength test and what is not, what the minimum frequency of testing is, what the acceptance criteria for strength tests are, and how to investigate strength tests not meeting the acceptance requirements. In addition, steps needed by a concrete supplier, in case acceptance criteria are not met, will also be discussed. To better understand discussed concepts, the presentation will use statistical concepts and numerical examples. A list of reading resources will be provided for those interested to study it in more detail.
Topics covered in this presentation include: • Definitions related to strength testing • Methods of sampling, fabrication, handling and curing strength test specimens • Acceptance criteria for strength tests • Interpretation of strength test results not meeting acceptance requirements • Investigation of non-compliant concrete • Addressing low strength concrete issues in production
Speaker:
Sponsors: This webinar is sponsored by the Intermountain Chapter of the American Concrete Institute, the Minnesota Concrete Council, the North Dakota Concrete Council, the Oklahoma Ready Mixed Concrete Association, the South Dakota Ready Mix Concrete Association, the Wisconsin Ready Mixed Concrete Association and the Nebraska Concrete & Aggregates Association.
South Dakota Ready Mix Concrete Association 5024 S Bur Oak Place #113A, Sioux Falls, SD 57108
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